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BIO 1500 Final Exam Questions And Answers
|Latest 2025 | Guaranteed Pass
Which of the following is the best modern definition of evolution - Answer✔change in allele
frequencies in population over time
Which of the following is not a correct version of one of Darwin's four postulates - Answer✔In
each generation, only as many offspring that can survive are provided
Evolution in a population of island finches can be caused by the following agent - Answer✔All of
the above
Biological fitness is best defined as - Answer✔relative the ability of an individual to produce
offspring that survive and reproduce
Cotton-topped tamarins are small primates with tuffs of long white hair on their heads. While
studying these creatures, you notice that males with longer hair get more opportunities to
mate and father more offspring. You believe that having longer hair is adaptive to these males.
To prove that this is an adaptation, you next should - Answer✔determine if hair length is
heritable
Which of the following statements describes natural selection best? - Answer✔Individuals with
the most favorable alleles survive and reproduce
Speciation occurs when populations become genetically isolated and then diverge due to
evolutionary mechanisms. Which of the following could be a dispersal event that would lead to
genetic isolation for populations in that habitat - Answer✔Some insects get blown in a storm to
a new mountain range, where they lay eggs.
Genetic drift occurs in a population. Which of the following statements might be true -
Answer✔Any of the statements can be true
Genetic variation - Answer✔must be present in a population before natural selection can act
upon the population
Which of the following is the least likely to result in the formation of new species -
Answer✔gene flow
1|Page
, ©THESTAR 2024/2025 ALL RIGHTS RESERVED 1:27PM. A+
Most Swiss starlings produce four to five eggs in each clutch. Starlings producing fewer or more
than this have reduced fitness. Which of the following terms best describes this situation -
Answer✔Stabilizing selection
In seed cracker finches from Cameron, small- and large-billed birds specialize in cracking soft
and hard seeds, respectively. If long-term climatic change resulted in all seeds becoming hard,
what type of selection would then operate on the finch population - Answer✔Directional
selection
You are performing a population census of crayfish in Hinkson Creek when you encounter an
individual with a trait that has never been seen before. Which of the following is a correct
statement regarding this adaptation - Answer✔None of these statements is correct
A biologist doing a long-term study on a wild spider population observes increased variation in
silk thickness, but no change in the mean thickness. Which of the following could the spider
population be experiencing - Answer✔disruptive selection
Genetic drift occurs in a population. Which of the following statements might be true? -
Answer✔Any of the above statements might be true
Which of the following is the most predictable outcome of decreased gene flow between two
populations - Answer✔increased genetic difference between the two populations
Three-spined stickleback fish show substantial heritable variation in gill-raker length. Fish
caught in open water tend to have longer gill rakes and eat different foods than do those
caught in shallower water. Longer gill rakers appear to function better for capturing open-water
prey, while shorter gill rakers function better for capturing shallow-water prey. Which of the
following types of selection is most likely to be found in a large lake. - Answer✔disruptive
selection
which of the folioing describes the most likely order of events in an allopatric speciation even -
Answer✔genetic isolation, genetic drift, divergence
There is an island in the middle of a large river that houses a large population of ants. Damming
of the river causes the island to flood and only the highest points of the island are now baove
water. The ants cannot swim, so are ow in multiple isolated populations.Which of the following
best describes this event - Answer✔This situation represents isolation by vicariance
A small number of birds arrive on an island from a neighboring larger island. This small
poopulation begins to adapt to the new food plants available on the island, and their beaks
being to change. About twice a year, one or two more birds from a separate population on the
neighboring island arrive. These new arrivals - Answer✔tend to slow the adaptation to the new
food plants
What is the process caused by the birds from the neighboring island described in question 20 -
Answer✔Gene Flow
2|Page
BIO 1500 Final Exam Questions And Answers
|Latest 2025 | Guaranteed Pass
Which of the following is the best modern definition of evolution - Answer✔change in allele
frequencies in population over time
Which of the following is not a correct version of one of Darwin's four postulates - Answer✔In
each generation, only as many offspring that can survive are provided
Evolution in a population of island finches can be caused by the following agent - Answer✔All of
the above
Biological fitness is best defined as - Answer✔relative the ability of an individual to produce
offspring that survive and reproduce
Cotton-topped tamarins are small primates with tuffs of long white hair on their heads. While
studying these creatures, you notice that males with longer hair get more opportunities to
mate and father more offspring. You believe that having longer hair is adaptive to these males.
To prove that this is an adaptation, you next should - Answer✔determine if hair length is
heritable
Which of the following statements describes natural selection best? - Answer✔Individuals with
the most favorable alleles survive and reproduce
Speciation occurs when populations become genetically isolated and then diverge due to
evolutionary mechanisms. Which of the following could be a dispersal event that would lead to
genetic isolation for populations in that habitat - Answer✔Some insects get blown in a storm to
a new mountain range, where they lay eggs.
Genetic drift occurs in a population. Which of the following statements might be true -
Answer✔Any of the statements can be true
Genetic variation - Answer✔must be present in a population before natural selection can act
upon the population
Which of the following is the least likely to result in the formation of new species -
Answer✔gene flow
1|Page
, ©THESTAR 2024/2025 ALL RIGHTS RESERVED 1:27PM. A+
Most Swiss starlings produce four to five eggs in each clutch. Starlings producing fewer or more
than this have reduced fitness. Which of the following terms best describes this situation -
Answer✔Stabilizing selection
In seed cracker finches from Cameron, small- and large-billed birds specialize in cracking soft
and hard seeds, respectively. If long-term climatic change resulted in all seeds becoming hard,
what type of selection would then operate on the finch population - Answer✔Directional
selection
You are performing a population census of crayfish in Hinkson Creek when you encounter an
individual with a trait that has never been seen before. Which of the following is a correct
statement regarding this adaptation - Answer✔None of these statements is correct
A biologist doing a long-term study on a wild spider population observes increased variation in
silk thickness, but no change in the mean thickness. Which of the following could the spider
population be experiencing - Answer✔disruptive selection
Genetic drift occurs in a population. Which of the following statements might be true? -
Answer✔Any of the above statements might be true
Which of the following is the most predictable outcome of decreased gene flow between two
populations - Answer✔increased genetic difference between the two populations
Three-spined stickleback fish show substantial heritable variation in gill-raker length. Fish
caught in open water tend to have longer gill rakes and eat different foods than do those
caught in shallower water. Longer gill rakers appear to function better for capturing open-water
prey, while shorter gill rakers function better for capturing shallow-water prey. Which of the
following types of selection is most likely to be found in a large lake. - Answer✔disruptive
selection
which of the folioing describes the most likely order of events in an allopatric speciation even -
Answer✔genetic isolation, genetic drift, divergence
There is an island in the middle of a large river that houses a large population of ants. Damming
of the river causes the island to flood and only the highest points of the island are now baove
water. The ants cannot swim, so are ow in multiple isolated populations.Which of the following
best describes this event - Answer✔This situation represents isolation by vicariance
A small number of birds arrive on an island from a neighboring larger island. This small
poopulation begins to adapt to the new food plants available on the island, and their beaks
being to change. About twice a year, one or two more birds from a separate population on the
neighboring island arrive. These new arrivals - Answer✔tend to slow the adaptation to the new
food plants
What is the process caused by the birds from the neighboring island described in question 20 -
Answer✔Gene Flow
2|Page
